I can do both, but I will admit that I have to put slightly more effort into winking with my left eye. That being said, I can't raise my left eyebrow worth shit and it pisses me off because I can do it so effortlessly with my right one
yes, I can also only wink with my right eye even to this day (should I call it my left eye since it's on the left side of my face, at least from my POV...) ... anyways, I can actually do a lot of things involving winking... I'll tell you one... prepared to be AMAZED! So, most people wink with one eye. I do it too, but rarely. You see, for some reason, I always wink with both my eyes secretly at almost all parts of the day... only the true thirsty peeps will get my signal...